Does the mother lose custody if she remarries?

Question:
The questioner says: I am a woman who married and was blessed with three children, a daughter and two sons. My husband passed away, and I left the middle son with his grandparents, his paternal grandfather and grandmother. Now I have remarried, and my husband’s father, who is their grandfather, has taken the daughter and the middle son who was with them, the first one, and the youngest son remains with me. The children are now nine years old, seven years old, and five years old. I want my children now, especially the daughter, because I cannot bear to be without her. What is the solution, Your Eminence the Shaykh?

Answer:
This matter is to be referred to the judges. This matter is to be brought to the judges, and there is blessing in them, if Allah wills. Unless a reconciliation is possible between you and the children’s grandfather, in which case reconciliation is good. If a reconciliation is possible between you two, and good men or good women are placed as intermediaries between you, so that they advise the children’s grandfather on something you are satisfied with, and you have some of them and he has some, and you agree on that, there is no harm. If reconciliation does not take place, the reference is to the Shari'ah courts. Yes.